This part is a kind of semiconductor called 8050D.

Function of this product has NPN Silicon Epitaxial Planar Transistor.

Manufacturers : SEMTECH

Image and pinout :

Some of the text within the PDF file :

ST 8050 (1.5A) NPN Silicon Epitaxial Planar Transistor for switching and amplifier applications. Especially suitable for AF-driver stages and low power output stages. The transistor is subdivided into two groups, C and D, according to its DC current gain. As complementary type the PNP transistor ST 8550 is recommended. On special request, these transistors can be manufactured in different pin configurations. TO-92 Plastic Package Weight approx. 0.19g Absolute Maximum Ratings (T a = 25oC) Collector Emitter Voltage Collector Base Voltage Emitter Base Voltage Collector Current Peak Collector Current Base Current Power Dissipation Junction Temperature Storage Temperature Range Symbol VCEO VCBO VEBO IC ICM IB Ptot Tj TS G S P FORM A IS AVAILABLE Value 25 40 6 1 1.5 100 1 150 -55 to +150 U [ ... ]

8050D PDF Datasheet Download